Smoke-consuming furnace.



m1. 630,460. Patented Aug. 8, I899.

a. LANGENBAGH.

SMOKE CON SUIIING FURNACE.

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No. 630,460Q Patent ed Aug. 8, I899] a. LANGE'N BACH. SMOKE OONSUMING FURNACE.

' Ap umion filed Sept. us, 1598.

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UNITED ST TES PATENT OFFICE.

GUSTAV LANGEN-BAOH, oreaneow, GERMANY.

SMOKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 630,460, dated August 8, 1899.

Application filed September 15, 1898. Serial No. 691,052. (No model.)

To all whom it may concern.-

, Be it known that I, GUSTAV LANGENBACH, a subject of the King of Prussia, German Emperor, and a resident of Grabow, near Stettin,

in the Kingdom of Prussia, German Empire, have invented certain new and useful Im provementsinSmoke OonsumingFurnaces,of which the following is an exact specification. To obtain a smokefree interior firing-that is to say, foraboiler'with one or more flametubes in which the grate is arranged in the;

surface-vim, the rear portion of the grate cross-section a construction devised for the above-mentioned purpose and applicable to ordinary flame-boilers, while in Figs. 3 and 4, also in longitudinal and cross-section, a con-. struction is shown devised for ships boilers.

Figs. 5 and 6 represent two longitudinal sec-' tions of a modified construction.

" The grate-surfaces aa a Fig.1, consist of one or more series of grate-bars. In the drawings three positions of such bars are assumed. Above the grate is freely arranged, Fig. 2, a strut-frame-like erection b b 12 1') b, which, as shown, consists of five stones, of which I) b are the supporting-stones,b b the strut-framelike part, and b the headstone.

The grate a a a is not closed, as usual, at the back with a higher fire-bridge, but has a smooth end, the rear grate part a being, by means of the separating-walls s 8, cut off or divided toward two directions iirst, toward the rear portion of the flame-tube, as also toward or against the front of the furnace viz., the part under the grate a a. Small airopenings a are, however, arranged or provided in the front wall 8. It is to be remarked that the two lower portions of the separating-walls s s are removable, so that with case all parts of the furnace can be cleaned from the front and freed from ashes, '&c. Behind the separating-wall s, as also behind the said erection b b I) Z) Z), is a wall 0, which tends to draw in or decrease the diameter over which the fire-gases spread or extend.

To explain the modus operandi of my invention I remark as follows: 'When the coal, -stoked upon the combustion-grate proper,a a, in the manner shown in the drawings, has to a large extent been burned or consumed, a fresh charge of coal will of course be necessary. Hereupon the remaining coal will be first brought more to the back of the furnace, so that the dotted line e e e will become, as it were, the upper dividing-line, whereupon the furnace will be again stoked, of course at the front portion of the grate, as the rear portion of the same is prevented or protected by the higher mass of the before-said glowing coal, and also by the fire-bridge 1) H12 from re ceiving any of the charge of coal.

When now the fire-door is closed, the following takes place: Upon the front portion of the grate a a a coking will take place for the reason that the gases generated or developing from the cold fuel are, as is clear, not hot enough to be at once ignited. These gases are forced to pass partly over and partly under the glowing fire-bridge b b b b" b and to come in contact with the glowing coal mass at t". The decrease of the extent over which the cold gases would otherwise spread, which decrease, as mentioned, takesplace at the fire-beam b b b b b and at the glowing-coal pile at 6, causes the cold gases to become heated and mixed with the ascending gases at 2", whereupon the said cold gases ignite in the space p, if they have not already ignited in the fines or chambers 19 and p In any case it is certain that before the said gases reach the before-mentioned rear wall 0, which is also highly heated, they must be ignited, for the reason that into the mixing-space 19 enter not only the hot gases emitted from 2', but also the gases which have penetrated the grate a Upon this grate portion a rests, of course, only a thin layer of coal, and, furthermore, only a small air-supply enters through the apertures a Thus between or from this portion a of the grate very hot and perfectly-ignited gases emitted,which mix I necessary, as the chamotte-stones of the said structure 0 are always in the region of the hottest fire-gases. It is alsoregarded as new that the rear grate portion 0, receives a contraction of the air-supply in consequence of the parting-wall 8 (provided with the beforesaid openings a only permitting a small access of air to this portion of the grate,whereby I attain the following: Upon this grate portion a as before stated, only the smallest layer of coal rests, as the stoker cannot with any degree of certainty push the glowing coal to the rear part of the grate without the risk of its falling behind the separating-wall 8. If this said grate portion a received a powerful air-supply, the said thin coal-layer upon a would not only quickly burn through, but such greater supply of air would cause too strong a draft through the grate portions (1 a, (for each of which parts a a the fire-bridge b b b hinders the influence of the stack or chimney.) Thus a stagnation would take place in the supply of air, the coal would not be consumed in suflicient quantity, the gratebars would not be cooled in snitablemanner,

and, furthermore, n0 sufficient development of steam would take place, nor would the grate be protected from burning. It will be thus clear that this contraction of the supply of air to the rear part a is one of the most important and characteristic features of the present invention, together or in combination with the before-said strut-frame-like structure of the I fire-bridge. Such contractions of this descrip-.

tion, as shown at 0 have, it is true, been hith- 'erto employed for a smooth grate where behind the grate a fire-bridge not of any especial height was erected; but such part was not hithi ply of air to the portion a of the grate; but

hitherto the discharging gases from this said grate. portion had been throttled. This 1 latter system is not, however, advantageous,

as it is thereby not possible during the operation to properly ascertainthe proportion of the throttling or contraction and to regulate the same. Thisregulation in the present invention can beeasily effected by closing one or more of the apertures .a,for which reason the arrangement of the contraction or throttling of the air supply to the rear portion of I the fire-grate, as herein described, and form- V hitherto known for this purpose.

the upper side of the fire-tube.

While the construction represented in Figs. 1 and2 is intended for land-boilers, the arrangement in Figs. 3 and 4 is adapted for shipsboilers. The latter differ only from the first mentioned in that the contracting wall 0 or throttling of the fire-gases, which, according to the arrangement of Fig. 1, is located at the bottom of the tube, is here (Figs. 3 and 4) arranged in the form of an arch on The gases passing over the fire-distributing bridge 6 b b Z) Z), as also underneath the same, are led downward throughout the arched structure 0 and thereby caused more intimately to mix with the hot gases coming from a Of course the same method of this last-mentioned contraction or throttling of the fire-gases may be also employed for land-boilers. The chief points are the especial arrangement of the boiler and the supply of air.

In Fig. 5 another modification of this arrangement is represented, in which both the before-mentioned strut-like frame structures can consist of two parts, and also the contracting or throttling of the rear part of the grate is movably arrangedt'. 6., movable in a horizontal direction and adjustable in a Vertical direction'so that when, on the one part, the throttling organ sis moved or adjusted by hand in the manner indicated in the drawings, Figs. 5 and 6, alarger portion of the grate is caused to form a burning-grate proper upon which the throttling of the air-supply acts. This result can also be achieved, on the other hand, by locating the throttling device of the air-space between the grate and the said air-throttling device in a higher position, so that, as desired, (or optionally,) more or less air can be conducted to the rear portion of the grate.

Fig. 5 shows the arrangement of the throttling device .9 in the modified form, as above mentioned, but in a rear View and in its low .est position.

Fig. Gshows the same air-throttling device .9 in its highest position, and, furthermore, in its most extended position, this position corresponding to the rear part of the grate from n to o of Fig. 1 and to 0. in Fig. 2, for

which said rear grate portion the air-supply is throttled in the manner above described. Having thus fullydescribed the nature'of this invention, what I desireto secure by Letters Patent of the UnitedStates is In a furnace, the combination with a grate 'Of a fire-bridge located above the rear portion thereof, and an adjustable air-throttling device located under the; grate and adapted to regulate the supply of air to the rear portion of the grate, substantially as set forth.

In witness whereof I have hereunto set my handin presence of two witnesses.

GUSTAV LANGENBAOH.

Witnesses:

' HENRY HARBOR,

ALBERT SYMANowsKI. 

